diff --git a/CHANGELOG.md b/CHANGELOG.md
index fe1a30d..8601be1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,7 @@
 
 * DNAME, DS, and TLSA record type support added.
 * Validate that healthcheck protocol is supported (HTTP, HTTPS, ICMP, TCP)
+* Validate that continent is supported (Antarctica is supported by octoDNS but not by NS1)
 
 ## v0.0.7 - 2023-11-14 - Maintenance release
 
diff --git a/octodns_ns1/__init__.py b/octodns_ns1/__init__.py
index 324eb8a..6f73be6 100644
--- a/octodns_ns1/__init__.py
+++ b/octodns_ns1/__init__.py
@@ -1038,6 +1038,17 @@ def _process_desired_zone(self, desired):
                     # no workable fallbacks so straight error
                     raise SupportsException(f'{self.id}: {msg}')
 
+                # validate supported geos
+                for rule in record.dynamic.rules:
+                    for geo in rule.data.get('geos', []):
+                        if (
+                            len(geo) == 2
+                            and geo not in self._REGION_TO_CONTINENT.values()
+                        ):
+                            msg = f'unsupported continent code {geo} in {record.fqdn}'
+                            # no workable fallbacks so straight error
+                            raise SupportsException(f'{self.id}: {msg}')
+
         return super()._process_desired_zone(desired)
 
     def _params_for_geo_A(self, record):
diff --git a/tests/test_provider_ns1.py b/tests/test_provider_ns1.py
index 5246553..395e522 100644
--- a/tests/test_provider_ns1.py
+++ b/tests/test_provider_ns1.py
@@ -1334,6 +1334,38 @@ def test_monitor_is_match(self):
             )
         )
 
+    def test_unsupported_continent(self):
+        provider = Ns1Provider('test', 'api-key')
+        desired = Zone('unit.tests.', [])
+        record = Record.new(
+            desired,
+            'a',
+            {
+                'ttl': 30,
+                'type': 'A',
+                'value': '1.2.3.4',
+                'dynamic': {
+                    'pools': {
+                        'one': {'values': [{'value': '1.2.3.4'}]},
+                        'two': {'values': [{'value': '2.2.3.4'}]},
+                    },
+                    'rules': [{'geos': ['AN'], 'pool': 'two'}, {'pool': 'one'}],
+                },
+            },
+            lenient=True,
+        )
+        desired.add_record(record)
+        with self.assertRaises(SupportsException) as ctx:
+            provider._process_desired_zone(desired)
+        self.assertEqual(
+            'test: unsupported continent code AN in a.unit.tests.',
+            str(ctx.exception),
+        )
+
+        record.dynamic.rules[0].data['geos'][0] = 'NA'
+        got = provider._process_desired_zone(desired)
+        self.assertEqual(got.records, desired.records)
+
     def test_unsupported_healthcheck_protocol(self):
         provider = Ns1Provider('test', 'api-key')
         desired = Zone('unit.tests.', [])